/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.euphoria.core.translate;



import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.operator.CompositeOperator;

import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.operator.base.Operator;

import com.bff.gaia.unified.sdk.values.PCollection;

import com.bff.gaia.unified.sdk.values.PCollectionList;



import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkState;



/**

 * A translator that expands {@link CompositeOperator composite operators}.

 *

 * @param <InputT> input type

 * @param <OutputT> output type

 * @param <OperatorT> operator type

 */

public class CompositeOperatorTranslator<InputT, OutputT, OperatorT extends Operator>

    implements OperatorTranslator<InputT, OutputT, OperatorT> {



  @SuppressWarnings("unchecked")

  @Override

  public PCollection<OutputT> translate(OperatorT operator, PCollectionList<InputT> inputs) {

    checkState(operator instanceof CompositeOperator, "Operator is not composite.");

    return ((CompositeOperator<InputT, OutputT>) operator).expand(inputs);

  }



  @Override

  public boolean canTranslate(OperatorT operator) {

    return operator instanceof CompositeOperator;

  }

}